Four full sides of shackle protection make this the strongest lock in its size with 25 more shackle coverage than any other shrouded padlock Patented Interchangeable Design allows you to swap shackles and cables in seconds without tools allowing for a full four sided shackle guard that is nearly impossible to cut Unique interlocked riveted steel construction and recurved design defends against hammer blows and theft Our zincplated carbon steel is highly rust and corrosion resistant RoHS Reduction of Hazardous Substances compliant zinc plating Boronalloy shackle is 50 harder to cut than casehardened steel and complies with ASTM 5 Shock Test Meets all US Military standards and manufactured to aerospace tolerances for the highest quality and security Dual hardened ball locking mechanism cannot be shimmed or bypassed High security cylinder with 10 security pins for ultimate antipick technology Guaranteed for Life Exceeds ASTM F88309 for bump resistance